I will say that it’s worth being careful: there’s no option for a backup XMPP account (so your account better have perfect uptime) and I very rarely have incoming phone calls actually work (calling out works, calling in is pretty random, most of the time it doesn’t even ring). Also the UI on the client is still pretty bad (especially for group texts, which are almost unusably bad).
All that being said, it’s a great service, just know what you’re getting into before you make it your primary phone number, it’s not nearly as polished as they make it sound.
I’m surprised to hear you’re having trouble with inbound calls not ringing. Do you have trouble with other inbound XMPP messages?
Not that I’m aware of
Using XMPP in combination with other legacy networks.
Related XMPP chat room